vietnamairlines.com

Checked 22 October 2026, 11:22 UTC · via 8.8.8.8
!Passed with warnings
25 passed 6 warnings 0 failed 2 info

SPF

pass

SPF record published

Found

Record
v=spf1 ip4:183.90.160.208/28 include:spf.protection.outlook.com include:_spf.salesforce.com ~all
DNS lookups
3 of 10
Void lookups
0 of 2

Checks

  • ✓ No deprecated ptr mechanism #1
    No ptr mechanism found in SPF record.
  • ✓ 3 of 10 DNS lookups #2
    SPF record needs 3 DNS lookups (limit is 10).
  • ✓ Ends with ~all #3
    SPF record properly uses ~all to restrict unauthorized senders.
  • ✓ Record published #6
    SPF record exists for this domain.
  • ✓ Single record #16
    Exactly one SPF record is published.
  • ✓ Valid syntax #25
    All SPF mechanisms and modifiers are valid.
  • ✓ No void lookups #26
    All include/redirect targets exist.
  • ✓ No overly broad IP ranges #27
    All ip4/ip6 ranges are narrow enough.

DMARC

warn

p=quarantine (_dmarc.vietnamairlines.com)

Found

Record
v=DMARC1; p=quarantine; pct=100; sp=quarantine; rua=mailto:dmarc-reports@vietnamairlines.com
Found at
_dmarc.vietnamairlines.com
TagValueMeaning
vDMARC1Version
pquarantinePolicy
spquarantineSubdomain policy
pct100Percentage of mail the policy applies to
ruamailto:dmarc-reports@vietnamairlines.comAggregate report addresses

Checks

  • !
    Policy: quarantine
    DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.
    #4
  • ✓ Record published #5
    DMARC record exists for this domain.
  • ✓ Valid syntax #17
    DMARC record syntax is valid.
  • ✓ Applies to 100% of mail #18
    DMARC policy applies to all failing mail.
  • ✓ Aggregate reports enabled #19
    Aggregate reports are sent to: mailto:dmarc-reports@vietnamairlines.com
  • ✓ Subdomain policy: quarantine #20
    Subdomains are covered by policy 'quarantine'.
  • ✓ Report addresses in own domain #29
    All report addresses are in your own organizational domain.

DKIM

warn

Selectors: selector1, selector2

Found

Selectors
selector1, selector2
_domainkey
NOERROR
SelectorKeyFlags
selector1public key is not valid base64
selector2public key is not valid base64

Checks

  • ✓ Keys found: selector1, selector2 #7
    DKIM keys found for this domain with selectors: selector1, selector2
  • !
    Unreadable DKIM key
    These keys could not be parsed, so signatures made with them will fail: selector1 (public key is not valid base64), selector2 (public key is not valid base64).
    #23
  • ✓ No problematic flags #24
    No keys in test mode, revoked, or limited to SHA-1.

DNSSEC

warn

Not signed

Found

DNSKEY records
No (0)
DS at parent
No

Checks

  • !
    Not enabled
    DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8

MX

warn

5 mail servers

Found

PriorityHostRecordsReverse DNS
10mail01.vietnamairlines.comA 183.90.160.211mail01.vietnamairlines.com ✓
10mail02.vietnamairlines.comA 183.90.160.212mail02.vietnamairlines.com ✓
10mail03.vietnamairlines.comA 183.90.160.213mail03.vietnamairlines.com ✓
10mail04.vietnamairlines.comA 183.90.160.214mail04.vietnamairlines.com ✓
50vietnamairlines-com.mail.protection.outlook.comA 52.101.137.2 A 52.101.137.0 A 52.101.124.117 A 52.101.157.80 AAAA 2a01:111:f403:cc09::1 AAAA 2a01:111:f403:cc1a::8 AAAA 2a01:111:f403:cc09:: AAAA 2a01:111:f403:cc1f::4no PTR mail-sg2pr03cu00500.inbound.protection.outlook.com ✓ mail-tydpr03cu00105.inbound.protection.outlook.com ✓ mail-os8pr02cu00100.inbound.protection.outlook.com ✓ no PTR mail-tydpr03cu00100.inbound.protection.outlook.com ✓ mail-sg2pr03cu00500.inbound.protection.outlook.com ✓ mail-os8pr02cu00104.inbound.protection.outlook.com ✓

Checks

  • ✓ 5 MX records #9
    Found 5 MX records for this domain.
  • ✓ All hosts resolve #10
    All MX records resolve to valid IP addresses.
  • !
    Hosts without IPv6
    The following MX hosts could not be resolved to IPv6 addresses: mail01.vietnamairlines.com, mail02.vietnamairlines.com, mail03.vietnamairlines.com, mail04.vietnamairlines.com
    #11
  • ✓ Redundant MX hosts #12
    Found 5 MX records, which provides redundancy for email delivery.
  • ✓ At most 5 MX records #13
    Found 5 MX records, which is within the recommended range (1-5).
  • ✓ No localhost targets #14
    No MX records pointing to localhost found.
  • ✓ No private IP addresses #15
    No MX records resolving to private IP addresses found.
  • ✓ No CNAME targets #22
    No MX records point to a CNAME.
  • !
    Addresses without reverse DNS
    These MX addresses have no PTR record, which many receivers treat as a spam signal: 52.101.137.2 (vietnamairlines-com.mail.protection.outlook.com), 2a01:111:f403:cc09::1 (vietnamairlines-com.mail.protection.outlook.com). Ask your hosting provider to set one.
    #30

TLS

warn

no MTA-STS · no TLS-RPT · DANE on 0 of 5 MX hosts

Found

DANE (TLSA records)

MX hostTLSADNSSEC
mail01.vietnamairlines.comnone-
mail02.vietnamairlines.comnone-
mail03.vietnamairlines.comnone-
mail04.vietnamairlines.comnone-
vietnamairlines-com.mail.protection.outlook.comnone-

Checks

  • !
    Not configured
    MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.
    #32
  • i
    Not configured
    TLS-RPT lets senders report TLS delivery problems to you. It is most useful together with MTA-STS or DANE.
    #35
  • i
    Not used
    No MX host publishes TLSA records. DANE lets senders verify your mail server's certificate through DNSSEC; it requires DNSSEC on the MX host's zone.
    #36

BIMI

pass

https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.svg

Found

Record
v=BIMI1; l=https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.svg; a=https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.pem
Found at
default._bimi.vietnamairlines.com
Logo
https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.svg
Certificate
https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.pem

Checks

  • ✓ Logo and certificate published #38
    BIMI logo: https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.svg; certificate: https://vmc.digicert.com/9219bdaf-53af-4794-b3c3-07922df84e85.pem
  • ✓ DMARC meets BIMI requirements #39
    DMARC is enforced on all mail, as BIMI requires.